Hi Jellington,
this looks like you are trying to run the batch from another location.
The call you you are trying to perform works only if you are in the folder where the file install-owd-hr.sh is located. If you are in another location you have to define the path to the file:
Jordans-MacBook-Air-2:bin jordan$ sudo /Location/HRinstall-owd-hr.sh -ap /Application/alfresco-4.2.c -u admin -p admin -cp 8081
Location in the example above is only a placeholder and has to be replaced by the correct location in your context.